The set_aumessage_mode function and its associated constants (MSG_QUIET,
DBG_NO) were removed from libaudit in version 4.1.1, breaking the ABI
and causing build failures.

This function call was redundant as it was setting the library's default
behavior (only receiving highest priority audit status messages). Remove
the obsolete call to restore compatibility with newer libaudit versions
while maintaining identical functionality.

The change is backward compatible and will compile successfully with both
older libaudit versions (that still contain the function) and newer
versions (where it has been removed).

Fixes: osquery#8665